Use exact tokens as sato math expr example (#272)

SHA: 439b57e
Reason: push, by y-guyon

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

index.html

@@ -1490,7 +1490,7 @@
 </style>
   <meta content="Bikeshed version 82ce88815, updated Thu Sep 7 16:33:55 2023 -0700" name="generator">
   <link href="https://AOMediaCodec.github.io/av1-avif" rel="canonical">
-  <meta content="d980c529b9a6197abe2e1895d32c2954d6ffb876" name="document-revision">
+  <meta content="439b57e9303a483d45f78e192a0baca5a895f92a" name="document-revision">
 <style>/* Boilerplate: style-autolinks */
 .css.css, .property.property, .descriptor.descriptor {
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@@ -3591,9 +3591,9 @@ <h4 class="heading settled" id="sato-example-residual-bit-depth-extension"><span
         <li data-md>
          <p><code><a data-link-type="dfn" href="#sato-token" id="ref-for-sato-token②③">token</a></code>=128 (sum)</p>
         <li data-md>
-         <p><code><a data-link-type="dfn" href="#sato-token" id="ref-for-sato-token②④">token</a></code>=0, <code><a data-link-type="dfn" href="#sato-constant" id="ref-for-sato-constant⑦">constant</a></code>=-128</p>
+         <p><code><a data-link-type="dfn" href="#sato-token" id="ref-for-sato-token②④">token</a></code>=0, <code><a data-link-type="dfn" href="#sato-constant" id="ref-for-sato-constant⑦">constant</a></code>=128</p>
         <li data-md>
-         <p><code><a data-link-type="dfn" href="#sato-token" id="ref-for-sato-token②⑤">token</a></code>=128 (sum)</p>
+         <p><code><a data-link-type="dfn" href="#sato-token" id="ref-for-sato-token②⑤">token</a></code>=129 (difference)</p>
        </ul>
      </ul>
    </ul>